The 10 average devs can produce hundreds of thousands of lines of buggy, poor performance code that implement thousands of features poorly in the same amount of time the senior developers could implement tens of thousands of lines of great code that implement hundreds of features perfectly.

But what if the three senior devs could produce thousands of lines of great code that implement thousands of features perfectly. I don't think this is the case but I believe this is what the OP means.

the interest is of course because what "the business" wants is thousands of features, perfectly or imperfectly is a secondary consideration.

on edit: changed senior devs hundreds of thousands to thousands because one benefit is that much of the code the average make is not really needed.